الفهرس 
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Abstract
At the beginning my all everlasting prayerful thanks go to ALLAH the Merciful, for being beside me in every step in my life and for covering me with his blessings. I wish to express my cardinal gratitude and my deepest thanks to the supervisors of the present work: prof. Dr. Ismail A.M.Eissa professor of Fish Disease and Management Faculty of Vet. Med. Suez Canal University, for his round supervision, continuous helpful, advice, guidance, criticism and actual cooperation encouragement in preparing and proposing the subjects of this work.I wish to express my deepest thanks and gratitude to Dr. HasanIbrahem Mohamed Derwa Ass. Prof. and head of Dep. of Fish Diseases Management Faculty of Vet. Med. Suez Canal University for his round supervision, continuous helpful, advice, guidance, criticism and actual co-operation encouragement in preparing and proposing the subjects of this work.I wish to express my deepest thanks and gratitude to Dr. Mona Mahmoud Ismail Ass. Prof Fish Diseases and Management Faculty of Vet. Med Suez Canal University, for her valuable guidance and continuous helpful during the study period.Special thanks to Dr. Maather Mohamed Monier El Lamie Lecturer of Fish Diseases and Management Faculty of Vet. Med Suez Canal University for her valuable guidance and continuous helpful during the study period.